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Prop Sizing and PSRU Gearing

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Bazooka

Member
Joined
Jan 20, 2018
Messages
15
Location
Australia
How does one go about matching a prop to a certain engine? Surely there would be some calculations involved, anything online or do I just need to talk to a manufacturer? Whats the rule of thumb?
Also when selecting gear ratio for PSRU what calculations are involved? Is is simply just a case of having max prop speed at engine redline or max power rpm?
 
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